Air-deflector for fire-box doors.



R. D. BALDWIN.

AIR DEFLECTOR FOR FIRE BOX DOORS.

APPLICATION FILED FEB- 3. I916.

mww, Patented Apr. 25, 1916.

THE COLUMBIA PLANOGRAPH .60., wAsmr w'rou, .P. O,

RICHARD DUBOIS BALDWIN, OF CHICAGO, ILLINOIS.

AIR-DEFLECTOR FOR FIRE-BOX DOORS.

iancee.

Specification of Letters ?atent.

Patented Apr. 25, 1916.

Application filed February 3, 1916. Serial No. 75,914.

To all whom itr'n/ag concern Be it known that I, RICHARD Donors BALD- WIN, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain Cir new and useful Improvements in Air-Deflectors for Fire-Box Doors; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to air deflectors more. particularly adapted for use in connection with fire box doors and it consists of the matters hereinafter described and more particularly pointed out in the appended claims.

The object of the invention is to provide a device which may be easily and quickly at tached to any fire box door back of the damper opening or openings, which will deflect the incoming cold air downwardly upon the fuel surface at the front end of the fire box, where it will be preliminarily heated in its contact with the hot fuel surface and will then more efficiently combine with the combustible gases arising from the fuel surface to produce efficient combustion. As is well known, the efficiency of fuel burnt in a furnace is largely diminished by reason of the escape through the stack of partly burned gases and of finely divided particles of unconsumed fuel. The gases and fuel particles are caused to be mixed with the proper amount of air by means of my improved deflector so that they are completely burned, thus increasing the efficiency of the furnace and also greatly reducing the amount of smoke issuing from the stack. In a fire box, the fuel door of which is provided with my improved deflector, the poorer kinds, as well as the better grades of fuel, burn to a powdery ash, thereby doing away with the formation of clinkers or slag, insuring longer life for the grate bars and greatly reducing the amount of fuel needed to maintain the proper degree of heat within the fire box.

The many advantages of my improved air deflector will be apparent as I proceed with my specification.

In the drawings, Figure 1 illustrates a longitudinal vertical fragmental sectional view through an ordinary steam boiler fire box to the fuel door of which has been attached my improved air deflector. Fig. 2 is a view in rear elevation and on an enlarged scale of my improved air deflector as when applied in place upon a fire box door having the usual damper opening. Fig.3 is a view in perspective of my improved air deflector as looked at from that side which engages the door, a part of said air deflector being broken away to clearly show the construction thereof. Fig. 41 is a vertical sectional view through the improved air deflector, the plane of said section being indicated by the line 4-& of Fig. 1.

Referring now in detail to that embodiment of my invention illustrated in the accompanying drawings :5 indicates as a whole, an ordinary steam boiler furnace; 6 indicates one of the side walls thereof; 7 and 8 indicate the front and bridge wall respectively of the furnace; 9 indicates the boiler; and 10 indicates the grate bars which are suitably supported at their ends in the usual manner by the said front and bridge walls.

11 indicates the fire box of the furnace and 12 indicates the fuel opening in the front wall 7, through which fuel is fed or introduced into said fire box. The fuel opening 12 is normally closed by means of the ordinary metal door 13 which is adapted to swing into an open position about vertically arranged hinges in the manner well known. The door 13 is provided with damper openings 14 which are adapted to be closed by the usual butterfly damper 15. All of the structure above mentioned is well known and further detailed description thereof is unnessary.

20 indicates my impreved air deflector. Said deflector is adapted to be attached to the inner face of the door 13 so as to depend in a position back of the damper 15. The deflector is a shell, open in front and at bot tom, made of metal (either cast or sheet) and comprises substantially triangular side walls 2121 and a rear wall 22. The upright front edges of the side walls 21 are adapted for engagement against the rear face of the door 13 and the rear wall 22 is inclined to said front edges outwardly, from its top to its bottom edges so that when the shell is attached to the door, said rear wall will engage the door at its top but will. extend downwardly and away from the plane of said door toward its bottom. At its top,

said. inclined rear wall 22 terminates in a 11 transversely extending flange 23, the front face of which is flush with the upright front edges of the side Walls 21,

24 indicates a transversely extending flange which connects the bottom ends of the said walls 21-21. Said flanges 23 and 24 are provided with longitudinal slots 25-26 respectively through which bolts 27 may be inserted to project through registering bolt apertures in the door 13 by means of which the deflector is securely attached to the inner face of the said door. The slots 2526 provide for lateral adjustment of the deflector so that it may be properly located relative to the damper.

The deflector 20 as a whole presents a throat, back of the damper. The front upright edges of the side walls 21 and the front faces of the top and bottom flanges 23 and 24 define an opening or mouth 30 and the bottom ends of said side walls and the rear face of the flange 24 and front face of the inclined rear wall 22 define an outlet opening 28. The latter is divided in the direction of the incoming air, by parallel spaced webs 29, connected at their ends to said flange 24 and said rear walls 22 respectively. Said webs 29 are of comparatively small depth and are tapered toward their top edges as shown in Fig. 4. The inner faces of the side walls 21 are inclined inwardly toward their bottom edges to correspond to the taper of the webs 29 for a purpose'now to appear.

The operation of my improved deflector is as follows: When attached to the inner face of a fire box door, the inlet opening or mouth 30 is centered relative to the damper openings and the edges or surfaces engaging the door are preferably sealed by means of cement or otherwise. through the damper openings 14 passes through the inlet opening or mouth of the deflector and is deflected downwardly by its inclined rear wall 22 toward the outlet opening 28. The webs 29 divide this opening into a plurality of restricted discharge openings so as to break up the body of inflowing air into a plurality of smaller bodies of air Which are discharged at increased velocity of speed of flow at the points Where they initially come into contact with the hot fuel. This air heated by contact With the hot fuel mixes with the unconsumed gases and burns them.

Copies of this patent may be obtained for five cents each,

Washington,

The air entering.

A fire box door to which my improved air deflector is attached may be as readily opened as before and the air entering the fire box through the damper openings keeps the deflector cool sothat it cannot burn out.

lVhile in describing my invention in the form herein illustrated T have referred to certain details in mechanical construction and arrangement of parts, I do not wish to be limited thereto except as may be pointed out in the appended claims.

I claim as my invention:

1. A deflector adapted for attachment to the door of a fire box back of the damper opening, comprising a shell formed to provide a throat having a horizontally presented inlet opening or mouth in line with said damper opening and a downwardly presented discharge opening near the bottom of said door, said throat having a wall adapted to deflect the body of air entering through the inlet opening or mouth, downwardly through the discharge opening, said shell having a plurality of up 'ight spaced webs in the discharge opening of said throat for splitting up the body of air passing through the discharge opening into a plurality of smaller bodies.

2. A deflector adapted for attachment to the door of a fire box back of the damper openings comprising a shell having triangular shaped side walls and an inclined rear wall, a transversely extending flange having bolt apertures at the top of said shell and a second flange in the plane of said first mentioned flange connecting said side walls at their bottom ends, said side walls and top and bottom flanges defining a horizontally presented inlet opening or month. said side walls. bottom flange and bottom end of said inclined rear wallv defining a downwardly presented discharge opening and a plurality of tapered webs in the said discharge opening for splitting up the body of air passing through the said discharge opening into a plurality of smaller bodies.

In testimony that I claim the foregoing as my invention I affix my signature in the presence of two witnesses. this 1st day of February. A. D. 1916.

RICHARD DUBOIS BALDWIN.

lVitnesses TAYLOR ll. Bnowx, T. H. Anrnnns.

by addressing the Commissioner of Patents. D. C. 

